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Metal oxide powder and method for the production of the same

a technology of metal oxide powder and method, which is applied in the direction of chromium oxide/hydrate, lanthanide oxide/hydroxide, niobium compounds, etc., can solve the problems of complex procedures, difficulty in obtaining raw materials, and difficulty in producing metal oxide powder containing less agglomerated particles,

Inactive Publication Date: 2001-10-16
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Another object of the present invention is to provide a production method which can be generally employed in the production of such metal oxide powder and is excellent industrially.

Problems solved by technology

The produced metal oxide powders have some problems such as formation of agglomerates, nonuniformity in the particles, a wide particle size distribution, and so on, and they are not necessarily satisfactory.
Further, the above production methods themselves have problems such as complicated procedures, problems of apparatuses, costs of raw materials, and so on.
When the average primary particle size of the raw material powder is larger than 0.1 .mu.im, the production of the metal oxide powder containing less agglomerated particles and having the narrow particle size distribution may become difficult.
When a molded material having the bulk density exceeding 40% based on the theoretical density is calcined, a sintering reaction proceeds in the calcination step, whereby grinding is necessitated to obtain the metal oxide powder, and the metal oxide powder having the narrow particle size distribution may not be obtained in some cases.
When the particle size distribution measured by such method is narrow but the powder contains the agglomerated particles, the dispersibility is deteriorated, and such powder is not suitable as an industrial raw material.
When the BET specific surface area is large, the powder contains many agglomerated particles and is not suitable as the industrial raw material.

Method used

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  • Metal oxide powder and method for the production of the same
  • Metal oxide powder and method for the production of the same
  • Metal oxide powder and method for the production of the same

Examples

Experimental program
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example 1

A metatitanic acid slurry (30 wt. % as reduced to titanium oxide weight. A product obtained in an intermediate step of the sulfuric acid method) was concentrated by an evaporator and then dried in an air at 200.degree. C. to obtain raw material titanium oxide powder. This powder had a BET specific surface area of 183 m.sup.2 / g (a primary particle size calculated from the BET specific surface area=0.008 em). According to the X-ray diffraction analysis, the powder was found to be anatase type titanium oxide, and no other peak was observed.

The raw material titanium oxide powder (1.2 g) was filled in an alumina vessel. Its bulk density was 19% of the theoretical density. Then, the powder was placed in the quartz muffle, and heated from room temperature at a heating rate of 500.degree. C. / hr. while flowing the atmosphere gas consisting of 100 vol. % of hydrogen chloride at a linear velocity of 20 mm / min., and calcined at 1100.degree. C. for 30 minutes, followed by spontaneous cooling to...

example 2

In the same manner as in Example 1 except that an atmosphere gas consisting of 10 vol. % of hydrogen chloride and 90 vol. % of nitrogen was used in place of the atmosphere gas of 100 vol. % hydrogen chloride, the rutile type titanium oxide was obtained. The results are shown in Table 1.

example 3

In the same manner as in Example 1 except that an atmosphere gas consisting of 30 vol. % of hydrogen chloride, 10 vol. % of steam and 60 vol. % of nitrogen was used in place of the atmosphere gas of 100 vol. % hydrogen chloride, the rutile type titanium oxide was obtained. The results are shown in Table 1.

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Abstract

A metal oxide powder except alpha-alumina, is disclosed comprising polyhedral particles having at least 6 planes each, a number average particle size of from 0.1 to 300 mum, and a D90 / D10 ratio of 10 or less where D10 and D90 are particle sizes at 10% and 90% accumulation, respectively from the smallest particle size side in a cumulative particle size curve of the particles. This metal oxide powder contains less agglomerated particles, and has a narrow particle size distribution and a uniform particle shape.

Description

The present invention relates to a metal oxide powder which is used as a raw material powder of an oxide ceramic that is used as a functional material or a structural material, a metal oxide powder which is used in a dispersed state as a filler or a pigment, or a metal oxide powder which is used as a raw material powder for the production of a single crystal or for flame spray coating, and a method for the production thereof.PRIOR ARTIn general, an oxide ceramic which is used as a functional material or a structural material is produced through a molding step and a calcination step from a metal oxide powder as a raw material. Properties of the metal oxide powder to be used as the raw material have a large influence on the production steps, and functions and physical properties of the ceramic product. Then, it is highly desired to provide a metal oxide powder having powder properties which are precisely controlled so that they are suitable for an intended application.When a metal oxi...

Claims

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Application Information

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IPC IPC(8): C01F17/00C01B13/32C01B13/14C01G23/00C01F5/00C01F5/02C01F5/06C01G49/06C01G23/047C01G25/00C01G49/00C01G15/00C01G19/00C01B13/18C01G49/02C01G25/02C01G19/02C04B35/628C01F17/235C01G23/04C01G23/08C01G29/00C01G30/00C01G33/00C01G35/00C01G37/02C01G39/02C01G45/12C04B35/626C08K3/22C08K9/02
CPCC01B13/14C01B13/18C01B13/185C01B13/32C01F5/02C01F5/06C01F17/0025C01F17/0043C01G15/00C01G19/02C01G23/047C01G25/02C01G49/0054C01G49/06C01P2002/02C01P2002/30C01P2002/50C01P2002/72C01P2004/03C01P2004/30C01P2004/50C01P2004/51C01P2004/52C01P2004/54C01P2004/61C01P2004/62C01P2006/12C09K3/1436C01F17/34C01F17/235
Inventor MOHRI, MASAHIDEKOIKE, HIRONOBUTANAKA, SHINICHIROUMEDA, TETSUWATANABE, HISASHISAEGUSA, KUNIOHASEGAWA, AKIRA
Owner SUMITOMO CHEM CO LTD
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